Experiment Quality Assurance

Recording duration and trial count validation for EEG and fNIRS modalities.

Recording Duration

Modality Duration (s) Status
EEG 1145.5s ✓
fNIRS 0.0s ✗

Valid Trials

Modality Valid Trials Expected Trials Percentage
EEG 24 24 100.0%
fNIRS 0 24 0.0%

EEG Channel Quality (Raw Data Metrics)

Channel Amplitude Range (ÂĩV) Std Dev (ÂĩV) Mean Correlation
Fp1 13.05 0.07 0.319
Fz 13.11 0.15 -0.186
F3 13.20 0.33 0.306
F7 13.33 0.33 0.311
F9 13.32 0.28 0.316
FC5 13.28 0.38 0.310
FC1 13.27 0.43 -0.282
C3 13.20 0.13 0.352
T7 13.38 0.13 0.362
CP1 13.35 0.19 0.335
Pz 409.43 22.42 0.003
P3 13.31 0.26 -0.222
P7 13.29 0.29 -0.240
P9 13.14 0.26 0.321
O1 13.23 0.35 0.315
Oz 13.33 0.34 0.311
O2 13.37 0.09 -0.035
P10 13.32 0.27 0.326
P8 13.33 0.09 0.220
P4 13.29 0.40 0.305
CP2 13.51 0.26 -0.205
T8 83.59 4.20 0.011
C4 13.31 0.28 -0.245
Cz 13.25 0.14 -0.163
FC2 13.28 0.28 -0.263
FC6 13.31 0.35 0.300
F10 13.29 0.26 0.304
F8 13.24 0.34 0.311
F4 13.25 0.09 0.377
Fp2 13.11 0.48 0.292

📊 SUPRA-SECTION 1: EEG ANALYSIS

Analysis of motor cortex activity during finger tapping task using 4 good EEG channels (C3, C4, F3, F4).

1.0 EEG Power Spectral Density (Preprocessed)

EEG Power Spectral Density

1.0.1 Left Hemisphere PSD by Condition

Left Hemisphere PSD by Condition

1.0.2 Right Hemisphere PSD by Condition

Right Hemisphere PSD by Condition

Event-Related Desynchronization (ERD) Analysis

Analysis Channel: C3

Metric Value Status
Alpha ERD (8-13 Hz) -0.3% (p=0.0500) ✗
Beta ERD (13-30 Hz) -0.3% (p=0.0500) ✗
Beta Rebound (post-task) 0.6% ✗

Expected Patterns:

  • Mu ERD: -20% to -40% during task (motor cortex activation)
  • Beta ERD: -30% to -50% during movement
  • Beta rebound: +10% to +30% after task cessation

🧠 SUPRA-SECTION 2: fNIRS ANALYSIS

Analysis of hemodynamic response in motor cortex during finger tapping task.

fNIRS Quality Metrics Summary

Metric Value
Total Channels 0
Bad Channels 0
Mean SCI 0.000
Mean Saturation % 0.00%
Mean Cardiac Power 0.000
Mean CV % 0.00%

Bad Channels Details

✓ All channels passed quality assessment

Hemodynamic Response Function (HRF) Validation

Analysis Channel: unknown

Metric Value Status
HbO Onset Time 0.0s ✗
Time-to-Peak 0.0s ✗
Plateau Amplitude 0.00 ξM (p=1.0000) ✗
Trial Consistency r=0.00 ✗

Expected Patterns:

  • HbO onset: 2-3s post-stimulus (neurovascular delay)
  • Time-to-peak: 4-8s for brief stimuli
  • Plateau amplitude: Significantly positive (p < 0.05)
  • Trial consistency: r > 0.5 indicates reliable response

🔗 SUPRA-SECTION 3: EEG + fNIRS (MULTIMODAL COUPLING)

Analysis of neurovascular coupling between EEG and fNIRS signals.

Neurovascular Coupling Analysis

Metric Value Status
Maximum Correlation r=0.00 ✗
Optimal Lag 0.0s ✗

Expected Patterns:

  • Negative lag: EEG changes precede HbO changes by 2-5s
  • Correlation strength: r > 0.4 indicates adequate coupling
  • Interpretation: Neural activity drives hemodynamic response
======================================================================
VALIDATION CRITERIA ASSESSMENT
======================================================================

EEG Analysis (Motor Cortex Activation):
----------------------------------------------------------------------
[FAIL] Alpha ERD significant: -0.3% (p=0.0500)
[FAIL] Beta ERD significant: -0.3% (p=0.0500)
[FAIL] Beta rebound observed: 0.6% post-task

EEG Summary: 0/3 criteria met

fNIRS Analysis (Hemodynamic Response):
----------------------------------------------------------------------
[FAIL] HbO onset detected: 0.0s (expected: 2-3s)
[FAIL] Time-to-peak plausible: 0.0s (expected: 4-8s)
[FAIL] Plateau amplitude significant: 0.00 ΞM (p=1.0000)
[FAIL] Trial consistency acceptable: r=0.00 (threshold: >0.5)

fNIRS Summary: 0/4 criteria met

Neurovascular Coupling:
----------------------------------------------------------------------
[FAIL] EEG precedes fNIRS: lag=0.0s (negative expected)
[FAIL] Correlation strength adequate: r=0.00 (threshold: >0.4)

Coupling Summary: 0/2 criteria met

======================================================================
OVERALL: 0/9 criteria met (0%)
======================================================================

✗ RECOMMENDATION: Validation failed. Major issues detected.
  Significant problems with:
  - EEG signal quality or task engagement
  - fNIRS optode coupling or hemodynamic response
  - Neurovascular coupling strength

  Recommend troubleshooting before proceeding.

Diagnostic Suggestions:
----------------------------------------------------------------------
â€Ē Alpha ERD not significant: Check C3 electrode placement,
  verify subject engaged in task, consider longer task duration
â€Ē Beta ERD not significant: Verify movement execution,
  check for excessive muscle artifacts
â€Ē HbO onset not detected: Check optode coupling (SCI),
  verify task timing, consider motion artifacts
â€Ē Plateau amplitude not significant: Check optode placement,
  verify task difficulty sufficient to elicit response
â€Ē Unexpected coupling lag: Verify temporal synchronization,
  check LSL timestamps, review event markers
â€Ē Weak coupling correlation: May indicate poor signal quality
  in either EEG or fNIRS, or weak task-related activation

Pipeline Configuration

Configuration parameters used for this analysis:

    {
  "eeg_enabled": true,
  "fnirs_enabled": false,
  "eeg_channels_of_interest": [
    "C3",
    "C4"
  ],
  "trials_per_condition": 12,
  "task_duration_sec": 15.0,
  "rest_duration_sec": 15.0
}